package part04_观察者模式.p02_观察者模式解决;

/**
 * @ClassName: Subject
 * @Author: AllenSun
 * @Date: 2019/12/6 19:53
 */
public interface Subject {
    public void registerObserver(Observer observer);
    public void removeObserver(Observer observer);
    public void notifyObserver();
}
